Adapter for punch tools



A ril 23, 1963 F. J Fox ADAPTER FOR PUNCH TQOLS Filed Dec. 8, 1959 3,086,419 ADAPTER FOR PUNCH TOOLS Frank J. Fox, Blue Bell, Pa., assignor to Wiedemann Machine Company, King of Prussia, Pa., a corporation of Pennsylvania Filed Dec. 8, 1959, Ser. No. 858,237 Claims. (Cl. 83-640) The present invention relates to punch mountings for punch tools involving adapters.

A purpose of the invention is to provide a diversity of diiferent angular positions in which the punch tool can be placed.

A further purpose is to provide precise alignment of the punch tool angularly in any one of several different positions. I

A further purpose is to adequately support and brace the punch tool against lateral forces, while permitting shifting to diiterent angular positions and accurate keying in a particular chosen angular position.

Further purposes appear in the specification andin the claims.

In the drawings I have chosen to illustrate a few only of the numerous embodiments in which the invention may appear, selecting the for-ms shown from the standpoints of conveniencein illustration, satisfactory operation and clear demonstration of the principles involved.

FIGURE 1 is atop plan view of a punch mounting according to the present invention.

FIGURE 2 is an axial section of FIGURE 1 on the line 2--2.

FIGURE 3 is a side elevation of the punch mounting of the invention.

FIGURE 4 is a section on the line 4-4 of FIGURE 2.

FIGURE 5 is a section on the line 55 of FIGURE 2.

FIGURE 6 is a bottom plan view of the punch mounting of the invention.

FIGURES 7 and 8 illustrate a variation.

FIGURE 7 is a fragmentary axial section similar to FIGURE 2 showing a variation.

FIGURE 8 is a section on the line 8-8 of FIGURE 7.

Describing in illustration but not in limitation and referring to the drawings:

In the prior art it is often desirable to use the same punch tool configuration at a variety of difier'ent angular positions. I

In the prior art two such positions could be obtained, since the punch tool was frequently mounted in a square slot in the punch holder. Other angular positions of the punch tool were obtained byproducing different punch tools having the same configuration but intended for mounting at different angular positions.

This procedure is subject to the disadvantage that extra punch tools must be stocked by the user, and that, therefore, the expense of maintaining an adequate supply of tools is greatly increased.

In accordance with the present invention, a single punch tool can be accurately set in any one of a variety of different angular positions, so that it is not necessary to have on hand a number of different punch tools of the same configuration to attain these angular positions. It is possible to shift the punch tool from one position to another in a very short time.

The invention will be applicable in any one of a wide variety of punch tool configurations, such as a vacuum tube socket, octol, amphemol, normal rectangular, square and other suitable configurations.

The invention is applicable to turret punch presses, and also to single tool punch presses and multiple punching presses.

The punch mounting according to the present invention United States Patent Ofice forward end of the punch holder.

includes a punch holder '20, a punch adapter 21 and a punch tool 22, having a punching end 22'.

The punch holder has a head 23 at the rearward end slotted at 24, to receive the gripping mechanism on the punch ram as well known in the art.

The lower end of the punch holder 20 has a central axial bore or opening 25 which is of circular cross section and receives a suitable circular shank 26 at the rearward end of the punch tool.

The punch holder 20 has rearwardly of the bore 25 a smaller opening 27 which receives a bolt 28 threaded into the shank 26 of the punch tool, and having a countersunk head.

The punch holder, at its forward end, has a concentric sleeve portion 30 of reduced diameter terminating in a shoulder 31.

The punch adapter 21 is on the forward end of the punch holder and has a bore 32 which receives the forward sleeve portion 30 on the punch holder and abuts against the shoulder 31.

There is a central longitudinal circular opening 33 through the adapter which receives the circular portion on the tool shank'26. Forward of the shank 26 there is a rectangular (square) portion 34 on the tool shank fittingagainst the walls of slot 34' across the forward end of the adapter.

A suitable slot 35 extending around the periphery of the round portion of the shank of the punch tool receives a snap ring which desirably holds the punch tool into frictional engagement with the adapter, so that the punch tool and adapter can be removed and will function as a unit.

It will be evident that from the standpoint of the broader aspects of this invention it is unimportant whether the punch tool and the adapter are made in one piece or are of separate pieces as shown, with capability of separation, suitably held together by the snap ring at 25, and permitting shifting of the position of the punch tool angularly with respect to the adapter in any one of the positions permitted by the rectangular (square) cross section at the lower end of the opening in the adapter 21 as shown at 34'. The character of the parallel sides of the slot at 34 engaging the square end 34 on the forward end of the punch tool is best seen in FIGURE 6.

At one side, extending longitudinally (parallel to the axis), the punch holder 20 has a slot 36 extending to the At .intervals around the outside of the adapter at a plurality of angular positions, there are key slots 37, which may suitably be less deep than the key slot 36. The key slots 37 are placed at a number of dilferent angular positions, such as 45 degrees, 30 degrees, and other suitable positions as desired. Since the squared portion of the punch tool can be turned degrees in the slot 34 it is therefore easy to obtain a 60 degree position. Other suitable angular positions of the slots 37 can be chosen to meet the requirements.

The key slot 36 and one of the key slots 37 is occupied by key 38 which is secured in the slots as by a bolt 40 threaded into the punch holder. The key in the form shown is conveniently reduced in thickness in the lower end at 41 and is suitably stepped at the inside at 42 so that it will bring friction engagement against the bottom of the chosen slot 37 and tend to hold the adapter 21 on the punch holder.

If the user desires other angular positions of the slots 37 which are not available on the usual adapter furnished, such as 15 degrees, 22 /2 degrees, etc., other adapters will be employed which can be interchanged with the adapter 21.

In some cases it will be preferable, instead of having the adapter surround a portion of the punch holder, to

Patented Apr. 23, 1963 have the adapter extend within an annular recess in the punch holder. In FIGURES 7 and 8 I show a punch holder 20', and omit the punch tool 22 and the bolt 28 for convenience in illustration. The lower portion of the punch holder has a bore 25 and a step bore 25' which receives an extension 43 on the rearward end of the adapter 21 so that the adapter telescopes with respect to the punch holder as in the form of FIGURES 1 to 6, but in the reverse relationship.

The punch of the invention can cooperate with any desired form of adjustable die holder, which may be of a character well known in the art.

In view of my invention and disclosure variations and modifications to meet individual whim or particular need will doubtless become evident to others skilled in the art, to obtain all or part of the benefits of my invention without copying the structure shown, and I therefore, claim all such insofar as they fall within the reasonable spirit and scope of my claim. 7

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. In a punch mounting, a punch holder adapted to be fixed to the ram of a punch press and to move longitudinally with respect to the punch press having along one side a key hole parallel with the axis of the punch, a punch adapter unit including a punch fixed in the said adapter unit at its forward end rotatably mounted on the forward end of the punch holder, the punch holder and the punch adapter unit extending one within the other, the punch adapter unit having around its circumference a plurality of longitudinal keyways which selectively align with said keyway on the punch holder with rotation of the punch adapter unit, a key in the keyway on the punch holder and in one of the keyways on the punch adapter unit, and means for fastening the punch adapter unit on the end of the punch holder to hold the punch adapter selectively rotationally fixed to said holder.

2. A punch mounting of claim 1, in which the punch adapter unit includes an adapter having a central longitudinal slot of rectangular cross section, and a punch extending through said longitudinal slot in fixed relation to said adpter and having a plurality of differently angularly disposed positions with respect to the adapter.

3. A punch mounting of claim 1, in which the punch adapter unit surrounds the punch holder.

4. A punch mounting of claim 1, having a longitudinal opening of circular cross section in the forward end of the punch holder, the rearward end of the punch adapter unit extending into said longitudinal opening.

5. A punch mounting of claim 4, in which the means for fastening the punch adapter unit on the end of the punch holder comprises a bolt extending longitudinally through the punch holder.

References Cited in the file of this patent UNITED STATES PATENTS 1,035,095 Kraut Aug. 6, 1912 1,167,771 McCloSkey Jan. 11, 1916 1,849,829 Gray Mar. 15, 1932 1,926,985 Podrabsky Sept. 12, 1933 2,227,081 Gray Dec. 31, 1940 2,580,366 Smith Dec. 25, 1951 2,920,913 Antila Jan. 12, 1960 

1. IN A PUNCH MOUNTING, A PUNCH HOLDER ADAPTED TO BE FIXED TO THE RAM OF A PUNCH PRESS AND TO MOVE LONGITUDINALLY WITH RESPECT TO THE PUNCH PRESS HAVING ALONG ONE SIDE A KEY HOLE PARALLEL WITH THE AXIS OF THE PUNCH, A PUNCH ADAPTER UNIT INCLUDING A PUNCH FIXED IN THE SAID ADAPTER UNIT AT ITS FORWARD END ROTATABLY MOUNTED ON THE FORWARD END OF THE PUNCH HOLDER, THE PUNCH HOLDER AND THE PUNCH ADAPTER UNIT EXTENDING ONE WITHIN THE OTHER, THE PUNCH ADAPTER UNIT HAVING AROUND ITS CIRCUMFERENCE A PLURALITY OF LONGITUDINAL KEYWAYS WHICH SELECTIVELY ALIGN WITH SAID KEYWAY ON THE PUNCH HOLDER WITH ROTATION OF THE PUNCH ADAPTER UNIT, A KEY IN THE KEYWAY ON THE PUNCH HOLDER AND IN ONE OF THE KEYWAYS ON THE PUNCH ADAPTER UNIT, AND MEANS FOR FASTENING THE PUNCH ADAPTER UNIT ON THE END OF THE PUNCH HOLDER TO HOLD THE PUNCH ADAPTER SELECTIVELY ROTATIONALLY FIXED TO SAID HOLDER. 